Quantum Well Laser Transistor With Integrated Fixed-Frequency Modulation
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Solution Overview
Problem
Existing systems for emitting lasers with fixed frequencies are bulky due to the combination of separate devices and frequency modulators, leading to significant laser loss during transmission.
Innovation Solution
A transistor design incorporating a first region, a second region, and at least one quantum well, where the quantum well emits a laser with fixed frequency using current and voltage modulation mechanisms, integrating the functionality of both the device and frequency modulator into a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate device and frequency modulator are used to emit laser with fixed frequency, then frequency modulation capability is achieved, but system volume increases and laser transmission loss occurs
Solution Approach 1:
The patent combines the laser generation function and frequency modulation function into a single integrated device. The transistor structure integrates the quantum well laser region with the frequency modulation region, eliminating the need for separate devices and reducing system volume while maintaining frequency modulation capability.
Solution Approach 2:
The integrated transistor device performs multiple functions simultaneously: it generates laser through the quantum well region and modulates the laser frequency through the frequency modulation region. This multi-functional design allows one device to replace what previously required separate components.
2Adaptability or versatility
If a separate device and frequency modulator are used to emit laser with fixed frequency, then frequency modulation capability is achieved, but laser transmission loss increases
Solution Approach 1:
By merging the laser generation and frequency modulation functions into a single integrated transistor device, the patent eliminates the transmission interface between separate devices. This direct integration removes the source of transmission loss while preserving the frequency modulation capability.
3Manufacturing precision
If quantum well is installed in the second region with specific material composition, then laser emission with fixed frequency is achieved, but device structure complexity increases
Solution Approach 1:
The patent applies local quality by using specific semiconductor materials (Aluminum gallium arsenide, Aluminum gallium indium phosphide, Indium gallium phosphide, Indium gallium nitride, or Zinc oxide) with appropriate bandgaps in the quantum well region of the second region. This localized material selection enables precise control of laser frequency while maintaining overall device functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The transistor effectively emits a laser with a fixed frequency, reducing volume and loss by utilizing a single integrated device, achieving stable and efficient frequency modulation.
Implementation Method 1
the current modulation mechanism changes carrier concentration of the at least one quantum well through the intrinsic current to make the at least one quantum well generate a first laser
Implementation Method 2
the voltage modulation mechanism utilizes Franz-Keldysh effect to modulate the first laser to emit the laser with the fixed frequency
Data Source
AI summary
A transistor for emitting laser with a fixed frequency includes a first region, a second region, at least one quantum well, and a third region. The at least one quantum well is installed in the second region, and the second region is coupled between the first region and the third region. When one of the first region, the second region, and the third region receives two signals, or two of the first region, the second region, and the third region receive the two signals respectively, the at least one quantum well emits the laser with the fixed frequency.